Switch mechanism



June .17, 1930. D. R. DAVIE S ,764.435

SWITCH MECHAfiIM iled Dec. 29, 1925 4 SheetsSheet 1 Fig.1.

WITNESSES: INVENTOR W BY 1 'A TTORNEY J 1930 D. R. DAVIES 1,764,435

SWITCH MECHANISM Filed Dec. 29, 1925 4 Sheets-Sheet 2 16H: l4 l8 v 1+ /3 l 9/ F Ly, r ljl I 4"!!! 00 via ROW/Z19.

.- ATTORNEY J i 1930- D. DAVIES 76 ,435

SWITCH MECHANISM Filed Dec. 29, 1925 4 Sheets-Sheet 3 WITNESSES: INVENTOR Dav/'0 ED010254 June 17, 1930. 0. R. DAVIES SWITCH MECHANI SM Filed Dec. 29, 1925 4 Sheets-Shet ATT'ORNEY Patented June 17, 193i UNlTEfi are DAVID REGINALD DAVIES, OF DIDSBUEY,

@FFECE ENGLAND, AESIGI-IOB T0 WESTINGHOUSE SHITO'H MECHANISM Application filed December 29, 1925, Serial No.

This invention relates to electrical switch gear of the truck or draw-out type for selectively connecting a feeder or equivalent conductor with either or both of two bus-bars.

Circuit breakers of the truck or draw-out type usually comprises a stationary support for a series of contact blades or receptacles for receiving corresponding or complementary contact jaws or plugs carried by a truck and connected to the contact aws or members of the circuit breaker carried by the truck. The stationary contact blades in certain types of apparatus are mounted in an enclosure or cell which encloses the circuit breakers truck, while in other types such as compound filled draw-out circuit breakers, the stationary contact members are mounted in receptacles mounted in a metal venclosure tilled with insulating com-, pound. The contact plugs are similarly mounted in a compound tilled casing carried by the truck and project therefrom and register with the receptacles of the stationary support. Circuit breakers of this latter type are exemplified in my application, Serial No. 70,542 filed November 21, 1925 ,(now Patent No.1,700,884) and assigned to the Westinghouse Electric 8: Manufacturing Company.

Circuit breakers of both types are commonly used in current supply circuits oi relatively large capacity, the contact receptacles and plugs constituting the disconnect switches that may only be separated after the circuit breaker is open. It is frequently desirable to provide an auxiliary bus bar and auxiliary disconnect contact members therefor, which may either constitute an auxiliary feeder or an auxiliary load circuit as conditions require, various means being provided to connect the auxiliary feeder or load bus through the circuit breaker when desired, for instance the means illustrated in the above referred to application.

An object of the invention is to provide a circuit breaker of the draw-out type, with simple and compact means for alternately or simultaneously connecting two separate 78,130, and in Great Britain January 7, 1925.

sets of bus bars of similar function, to the circuit breaker.

Another object of the invention is to provide a circuit breaker having bus bar selective apparatus carried on the truck with the circuit breaker.

Another object of the invention is to provide a draw-out circuit breaker having means directly associated with the circuit breaker elements for selectively connecting the bridging switch member thereof to two or more separate contact terminals carried by the truck on which the circuit breaker is mounted.

A further object of my invention is to provide a draw-out circuit breaker of the compound filled type wherein the selective mechanism contained within the circuit breaker tank and the compound filled portion of the truck and which is operable from the GTitEllOl' of the enclosures.

These and other objects that will be made t tiroughout the further descripthe invention are attained by the apparatus hereinafter. described and illustrated in the accompanying drawings wherein Fig. l is a vertical section through that portion of a circuit reaker unit oi the draw-out type that is mounted upon the truck or movable unit, and which embodies 'es of the invention.

2 is a vertical section through a similar portion of a circuit breaker unit, illustrating a modified "form of selective apparatus.

Fig. 3 is vertical section through a further modified form of draw-out unit, and

Fig. 4 is a perspective view of-a further modified drawbut unit, the casing being cut away for disclosing interiorly disposed apparatus.

In each figure of the drawings 1 represents the draw-out portion of switch gear of the above mentioned type which may be withdrawn from the stationary portion of the unit and which may slide or roll upon suitable guide ways, 2 a feeder contact, 3 and 4: bus bar contacts for engaging stationary disconnect sockcts 2', 3 and 4 respectively, 5

a stationary contact in permanent connection to the feeder contact 2, and 6 a bridge piece adapted to co-act with the contact and at least one other contact to connect the feeder with the one or the other or both of the bus bars.

In the construction illustrated by Fig. 1, which is a more or less diagrammatic representation, the bus bar contacts 3 and 4 are connected respectively through slidable connections 7 and 8 with contact members 9 and 10 adapted to co-act with the bridge switch member 6. Rods 7a and 8a are provided whereby either. or both of the contacts 9 and 10 can be moved to a position or positions'to be engaged by the bridge switch member 6 when the latter is moved to the closed'position shown.

In the construction illustrated by Fig. 2, which is a sectional elevation also more or less diagrammatic, the bus bar contacts 3 and 4 are-connected respectively, through slidable connections, one only of which, designated by the numeral 7 is shown, with plunger contact members 11 and 12 at the upper end of which are racks 13 and 14 engaging a pinion 15. This opinion can be rotated by means of the sprockets 16 and 17, the chain 18 and the control lever 19 for the purpose of selectively moving the contacts 11 and 12 into or out of engagement with'a fixed contact member 20 which is engaged by the bridge switch member 6 when the latter is moved to closed position.

In the modified construction illustrated by Fig. 3, the bus bar contacts 3 and 4 are each permanently connected with separate fixed contact members 21 in which are respectively mounted plunger contact members 23 and 24, the upper ends of which are connected with bell crank levers 2.5 and 26 connected with a common link 27, which is in turn con nected with a control lever 28, the arrangement being such that by manipulation of the lever 28-the plungers 23 and 24 can be selectively projected into or out of engagement with a fixed contact member 29 which is engaged by the bridge switch member 6 when the latter is moved to closed position.

In the construction illustrated by Fig. 4, which is a sectional perspective view, the contact members 3 and 4 are connected'respectively through flexible leads, one only of which, designated by the numeral 30, is shown, with plunger contacts 31 and 32 connected at their upper, ends with rocking levers 33 and 34 fixed upon shafts 35 and 36. These shafts are operatively connected with hand levers 37 and 38by which either or both of the contact members 31 and 32 can be projected into engagement with a fixed contact 39 which is engaged by the bridge switch member 6 when the latter is 55 moved to closed position.

surface of the liquid.

The operation of the contacts connected with the bus bars may be effected by remote control, suitable indicating devices being provided on the switch gear itself or on the control board to indicate which bus bar is selected.

In some cases a separate switch, usually oil the oil-immersed type, may be provided for directly coupling the bus bars when it is desired to change the feeder connection from one bus bar tothe other without interrupting the supply.

It will be understood that the particular applications of the invention described above are illustrative only, and that many other forms and applications may be devised without departing from the scope of the invention as defined by the following claims.

Iclaim as m invention:

1. The combination with a circuit breake having a pair of separate main contact members and a bridging'switch member'for connecting the said contact members, of a plurality of conductors and means for selectively connecting one of the contact members to any of the said conductors and for permitting one only of the conductors to be connected to the said contact member at one time including conductor membersmovable into engagement with the last said contact members. I

2. The combination with a circuit breaker having a pair of separate main contact members and a bridging switch member for connecting the said contact members, of a pair of separate conductors, means for selectively connecting the conductors to one of the said contact members including separate conductor members movable into conductive engagement with the last said. contact member,

and means for preventing simultaneous en'- gagement of the said conductor members with the last said contact member.

3. The combination with a circuit breaker having a housing containing insulating liquid and a main contact member and a bridging switch member for engaging the main contact member, immersed in the liquid, and means for selectively connecting the bridging switch member in circuit with a plurality of separate conductors, comprising movable conductor members extending into the housing and adapted to be alternatively connected in circuit with the bridging switch member at a 4. A draw-out circuit breaker comprising a circuit-breaker housing containing insulating fluid, a circuit breaker therein comprising a bridging switch member, a housing superimposed upon the circuit-breaker housing and having bus-bar-engaging contact members thereon, and containing an insulating compound, and separate movable conpoint beneath the rese.

ductors connected separately to said contact members and extending through the last said housing and into the first said housing for selectively connecting the bridging switch to the said contact members.

5. A draw-out circuit breaker comprising a circuit-breaker housing containing insulating fluid, a circuit breaker therein comprising a bridging switch member, a housing superimposed upon the circuit-breaker housing and having bus-bar-engaging contact members thereon and containing an insulating compound, and separate movable conductors connected separately to said contact members and extending through the last said housing and into the first said housing for selectively connectingthe bridging switch to the said contact members, the said movable conductors being operable exteriorly of the said housings.

In testimony whereof, I have hereunto subscribed my name this 8th day of December 1925.

DAVID REGINALD DAVIES. 

